1、BRITISH STANDARD BS EN 12248:1999 Sawn timber used in industrial packaging Permitted deviations and preferential sizes The European Standard EN 12248:1999 has the status of a British Standard ICS 55.160BSEN 12248:1999 This British Standard, having been prepared under the directionof the Sector Commi
2、tteefor Building and CivilEngineering, was publishedunderthe authority ofthe Standards Committee andcomesinto effect on 15October1999 BSI 02-2000 ISBN 0 580 32671 3 National foreword This British Standard is the English language version of EN 12248:1999. The UK participation in its preparation was e
3、ntrusted by Technical Committee B/543, Round and sawn timber, to Subcommitte B/543/3, Timber in pallets and packaging, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, an
4、d keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or Europ
5、ean publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the neces
6、sary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN
7、title page, pages 2 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN 12248:1999 BSI 02-2000 i Co
8、ntents Page National foreword Inside front cover Foreword 2 Text of EN 12248 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN12248 June1999 ICS55.040; 79.040 English version Sawn timber used in industrial packaging Permitted deviations and preferential sizes Bois scis utiliss dans lemba
9、llage industriel Ecarts admissibles et dimensions prfrentielles Schnittholz in Industriepackmitteln Zulssige Abweichungen und Vorzugsmae This European Standard was approved by CEN on 2 May 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions
10、for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three offici
11、al versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Be
12、lgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secreta
13、riat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12248:1999 EEN12248:1999 2 BSI 02-2000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 175, Round and sa
14、wn timber, the Secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1999, and conflicting national standards shall be withdrawn at the latest by December
15、 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norwa
16、y, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Measurement 3 5 Changes in size due to changes in moisture content 4 6 Permitted deviations 4 7 Preferential sizes 4 7.1 General 4 7.2 Preferen
17、tial sizes 4 Table 1 Dimensions and their permitted deviations 4 Table 2 Preferential sizes 4EN12248:1999 BSI 02-2000 3 Introduction This standard specifies permitted deviations and preferential sizes for sawn timber used in industrial packaging. A range of cross-sections likely to be readily availa
18、ble is given to assist both producers and users. Preferential sizes are recommended for the manufacture of industrial packaging. They are considered as basic sizes at a moisture content of20%. The standard also stipulates the use of electric moisture meters for the measurement of moisture content. T
19、his reference moisture content of 20 % does not prevent manufacturers from manufacturing industrial packaging with either dry or green timber. 1 Scope This standard specifies permitted deviations (due to variability in sawing and processing) from target thicknesses and widths for sawn timber used in
20、 industrial packaging when measured at a defined reference moisture content. It also gives preferential sizes of this timber. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appr
21、opriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publi
22、cation referred to applies. EN 336, Structural timber Coniferous and poplar Sizes, permissible deviations. EN 844-4:1997, Round and sawn timber Terminology Part 4: Terms relating to moisture content. EN 844-6:1997, Round and sawn timber Terminology Part 6: Terms relating to dimensions of sawn timber
23、. EN 1309-1, Round and sawn timber Method of measurement of dimensions Part 1: Sawn timber. prEN 13183-1, Round and sawn timber Method of measurement of moisture content Part 1: Method for determining moisture content of a piece of sawn timber (Oven-dry method). prEN 13183-2, Round and sawn timber M
24、ethod of measurement of moisture content Part 2: Method for estimating moisture content of a piece of sawn timber (Electrical method). 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 actual size size of a piece of sawn timber at the time of measurement EN 844-6:
25、1997 3.2 moisture content mass of moisture in wood expressed as a percentage of its oven-dry mass EN 844-4:1997 3.3 moisture content size deviation difference between an actual size and the corresponding basic size, making allowance for the difference in size due to difference in moisture content ac
26、cording to this standard 3.4 permitted dimensional deviations the permissible variation of the actual size (length, width and/or thickness) from the referenced basic size resulting from sawing or processing 3.5 Target size, basic size For the purposes of this standard, basic size and target size are
27、 the same. 3.5.1 target size size desired after a particular production process (at a specified moisture content) to which the permitted deviations are related EN 844-6:1997 3.5.2 basic size size by which sawn timber is known or specified at a stated moisture content EN 844-6:1997 4 Measurement The
28、measurement of the moisture content shall becarried out according to prEN 13183-1 or prEN13183-2. The reference moisture content for measurement is20 %.EN12248:1999 4 BSI 02-2000 5 Changes in size due to changes in moisture content Unless there is evidence to the contrary, it shall be assumed that t
29、he thickness and width of a piece oftimber increase by 0,25 % for every 1 % of moisture content from 20 % up to 30 %, and decrease by 0,25% for every 1 % of moisture content below20%. The above values are typical, regardless of the species. 6 Permitted deviations The permitted deviations on thicknes
30、ses and widths at 20 % moisture content are specified in Table 1. Table 1 Dimensions and their permitted deviations 7 Preferential sizes 7.1 General The sizes are measured according to EN 1309-1. 7.2 Preferential sizes Preferential sizes are given in Table 2. Table 2 Preferential sizes Dimensions mm
31、 Permitted deviations Thickness and/or width k 100 +3 1 Thickness and/or width 100 +4 2 Component length +1 3 NOTE 1These permitted deviations are in accordance with class 1 of EN 336. NOTE 2More restrictive permitted deviations can be specified in contracts if necessary. Basic cross-sections Thickn
32、esses mm Widths mm 75 100 125 150 175 200 225 250 300 16 x x 18 x x x x 22 x x x x x 25 x x x x x x 32 x x x x 38 x x x x x x x x x 50 x x x x x x x x x 63 x x x x x x x 75 x x x x x x x x x 100 x x x x x x x NOTEOther dimensions can also be used in national rules.blankBS EN 12248:1999 BSI 389 Chisw
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